Usability: Pressing Enter in Find Project Version should trigger search, not close the search window.
Version-Release number of selected component (if applicable):
Zanata version 1.6.0-beta-2-SNAPSHOT (20120530-0019)

Added a function to capture the enter key on the text field and submit the form instead of closing the dialog.
Testing notes:
Go to "Groups" and select a group.
Click on "Add Project Versions". The project version search dialog should open.
Type a search term and hit 'Enter'.
The dialog should perform the search and it should remain open.
See:
http://github.com/zanata/zanata/commit/3cdfa30c24e4cc7ec4cfb4e6e19de1edcdb2ad13